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Steel Designers' Manual - 6th Edition (2003)
208 Other structural applications of steel
enclosure 2—3 m above bearings or horizontal tronslotion of strut
occupied space for more
effective environmental
relieve temperature effects
control airflow to offset heat
gains and
ere
Fig. 5.38 Half portal
good location
for
pl
the
yoc
shading excludes
summer sun but allows
winter sun to penetrate
heating or cooling
profile of roof steelwork forms
natural smoke reservoir and
perimeter structure provides
nominal lateral restraint to
venting at top
roof enclosure but majority
of vertical load is supported
shading
by interior columns
fire resistant
base of smoke reservoir 3 m —i existing perimeter
higher than 1st floor deck structure with limited
allows means of escape load bearing capacity
Fig. 5.39 Beam and column
• The horizontal forces imposed at the supports. Horizontal thrusts introduced
at lower levels will have smaller resultant overturning effect than at a higher
level.
Failure to investigate the implications of the choice of structural form could result
in a costly and clumsy solution.
As town centres and streets are redeveloped to compete with out-of-town shopping,
the need for enclosure is a common solution, often considered. In these cases,
the adjacent buildings are typically of a wide variety of constructions of various
heights and condition.The solutions defined in Fig. 5.39 may be appropriate to avoid
the complexities of resolving the various boundary conditions. The perimeter struc-